10 How will this help? Use a cluster file system for big file (bandwidth) I/O for scalable systems Focus on performance for applications Use commercial NAS products to provide solid storage for home directories and shared files Vendors looking at NFS performance, scalability Use new technologies nearline disk, virtual tape in addition to or instead of physical tape for backup and data migration Higher reliability and performance May 07 Cray Technical Review 9

12 Why NFS? NFS is the basis of the NAS storage market (but CIFS important as well) Highly successful, adopted by all storage vendors Full ecosystem of data management and administration tools proven in commercial markets Value propositions ease of install and use, interoperability NAS vendors are now focusing on scaling NAS Various technical approaches for increasing client and storage scalability Major weakness performance Some NAS vendors have been focusing on this We see opportunities for improving this May 07 Cray Technical Review 11

15 Quick Summary of Benchmarking Results A total of over 400 TB of data has been written without data corruption or access failures There have been no major hardware failures since testing began in August 2006 predictable and relatively uniform. with some exceptions, the BlueArc aggregate performance generally scales with the number of clients Recovery from injected faults was fast and relatively transparent to clients 32 test cases have been prepared, about 28 of varying length have been run, all file checksums to date have been valid Early SLES9 NFS client problems under load, detected and corrected via kernel patch; this led to the use of this patch at Cray s AWE customer site, who experienced the same problem May 07 Cray Technical Review 14

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